Improved screw-threading- machine



2 Sheets-Sheet 1.

T. T. PROSSER. CUTTING SCREWS.

No: 108,776. Patented May 3-1, 1870.

i a @l r WITNESSES INVENTOR 2 Sheets-Sheet 2.

T. T. PROSSER.

CUTTING SCREWS. 6- Patented May 31, 1870.

E v w & k

illlllllil WITNESSES- Y waited scan TREAT T. rnossnn. or CHICAGO, iLLINOIS.

Letters Patent No. 103,776, dated May 31,1870.

IMPROVED SCREW-THREADING- MACHINE.

The Schedule refon'edtq in these Letters Patent and making part of the same To all whom it 'nm-y concern:

Be it known that I, TREAT '1. Pnossnruof Ohi-v cago, in the county of Cook and State of Illinois, have invented a new and useful Improvement; in Screw forming Machines; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had totlre annexed drawing making part of this specification, in which- Figure 1 is a plan ortop view of the machine, showing the frame, the driving-pulleys,the gear-wheels upon the shafts to which the disks are secured, the thread-tbruring disks, and the graduated guide for the bolts to be threaded.

Figure 2 is a bottom view, showing the driving-pulleys with their shaft, and the arrangement of the drivingegears.

Figure 3 is a vertical central section on line a: x of fig. 1, showing the arrangement of-the guide, with reference to tlhe threading-disks.

- Figure 4 is a side elevation of the guide, showing rhe arrang ement of the stops for regulating thelength of the threads.

Figure 5 is a face view of one of the threadingdisks, showing the recesses in its face.

Corresponding letters refer to corresponding parts in the several figures.

This invention relates to that class of machines which is designed for threading bolts or forming screws upon rods of metal, whether such bolts or rodsv are heated, for the purpose of facilitating the operation, or are cold, as in the usual method; and- It is designed as an improvement upon a machine for which Letters Patent were granted to me on the 29th of June, AD. 1869.

To this end the invention consists in the constguc tion, 'oornbinatiom and arrangement of certain parts of the machine, the object being to facilitate the threading of bolts or rods by providing the meansv for threading two or more at the same time, and dispensing with thefnecessity of shifting the dies at each' operation, as in the said former machine.

To enable those skilled" in the art to make and use my invention, 1' will proceed to describe its con,- struction and operation.

A in the drawing represents the. frame of the rn'achine, which may be of the fornhshown' iii thedrawing, or itmay be of any other form of construct-ion suitable to receive and sustain the parts which are attached thereto. B represents a loose pulley, over which the drivingbelt passes when the machine is to be stopped for any purpose. It is to be placed upon the driving-shaft O, and by the side of the pulley B, which is to be secured to such shaft, so that, when the belt is placed upon such pulley, the moving parts of the machine will be ut in motion.

0 represents the drivingshaft abo'vc referred to, which is to be secured in suitable bearings formed upon or attached to the main frame, througlr onc' end of which it passes, for the purpose of enabling it to receive upon its outer end the driving-pulleys.

D D represent gear-wheels, which are to be firmly secured upon the driving-shaft O, in such positions as to bring them in line vertically wit-Ir the wheels E D represents a gear-wheel, which is to be secured to a courrtershaft whichhas its hearings in the main frame, or in hangers attached thereto. Thisinternrediate wheel receives its motion from the wheel D, its oflice being to give the large wheel into which itmeshes a motion in the opposite direction from thatgiven to, the wheel E, which is driven by the wheel D upon the driving-shaft.

E rcpresents a gear-wheel, which may be ofany diameter required to give the requisite 'motion as the shaft F, upon which it is firmly secured, so as to'cause N said shaft to rotate with it. rotate by the wheel D, and, consequently, its periplr-' This'wheel is caused to cry at the point of contact will move in the same'direction as does the periphery of said wheel.

E represents another gear-wheel of the same. dimcu-.

sions as the whe'elE, and secured upon the shaft F. This wheel receives-its motion from the intermediate wheel D, andas such wheel is driven by the wheel D, secured to the same shaft, and, consequently, revolving in the same direction as the wheel D, it follows that the wheel E will-be rotated in a direction opposite-to the one in which tire wheel E is moving, the object-of which arrangement will soon be explained.-

F represents a shaft, which is to be arranged in suitable bearings, which are attached to the main frame. Its position is to be parallel .to that of the driving-shaft, so that the wheel '11], which is secured thereto, shall mesh intoand be driven by'the wheelD uponsuch driving-shaft, The-outer end of this shaft rests in a bearing having asooket upon its outer end,

through the cap of which there is inserted a set-screw, which bears against the end of said shaft, so that, in the event of any wearing away of the parts, or in the event of itsbecoming necessary to change the ma chine, to thread differe'rrkslzed bolts, it can be done by the movements of this set-screw.

1" represents another shaft, in all respects like the while being threaded, it being apparent that, without such movemeht, no thread could be formed, as in the event of a rotary. movement only of the bolt there.

would be formed grooves or channels around such bolt, but they would not be in the form of screw-threads. I

In arranging these shafts with reference to. the above-described result, care-should be taken to have one'of them as much above a line drawn through the center of the guide H as. the other is below such line.

G G represent the thread-forming disks, which are to be secured to the inner endsof the shafts F 1 Being thus secured, it follows that their thread-forming surfaces will be one as much-above and the other as much below the center of the guide H as are the centers of the shafts upon which. they are mounted. The general outline of these disks may be such as is shown in fig. 1, or it may be anyother thatwill give the overhanging projection in which to form, the annular grooves showu in figs. 3 and 5. These grooves in different disks are to be of different sizes, varying according to the number of threads to the inch, and the dimensions of the bolt to be threaded. It being apparent that the projections which alternate. with the grooves are what forms the thread'u follows that they should be of the same angles and sizes as the grooves. In figs. 1, ,3, and 5, these disks are shown as having recesses'formed in their faces directly opposite to each other. These recesses are of such depth as to remote ali ofthe grooves and projections where they are cut.

This feature in the construction of these disks forms an important part of my improvement, and constitutes guide H, so that, by thrusting a bolt in through such recesses at that time, the groovedportions of the disks will, on coming in contact therewith, thread such bolt and cause it to recede out 'of such guide, thus leaving it incondition to receive another blank.

pen the bolt, it-

This arrangement necessitates the constructing oi the threed-forming disks of such diameter that the desired length-of thread maybe formed while the disks are performing about one fourth of a revolution. H representsa guide, which is tobe placed between the threading-disks, it being constructed as "shown in fig. 4, and resting in bearings formed in the frame of the machine. Its journals are hollow, which admits of the bolts being passed through them. That portion of this guide which is within the framehas a slot or groove formed in it, which allows the portions of the bolt which protrude through to comein contactjwith the disks, and thus be rotated and threaded.

The slotted portion of this guide is provided with stops held in position by set-screws, as shown in fig. 4, so that they may be set in any desired position, and thus the length of the thread upon each bolt can be determined.

Having thus described 'myinvention,

;.What I claim, and desireto secure by LettersPat eii-t, is

1. The improved disks, constructed substantially as set fort-h, having recesses out transversely across their thread-ibrming faces,substantially as and for the purpose set forth.

' 2. Said improved disks G G, constructed 'substan tially as described, arranged to revolve in parallel planes, upon shafts set in diiferent horizontal planes, substantially as set forth. 7

3. The arrangement of the said improved disks G ,G, in relation to one another, and also to the guides H H, substantially as and tirr the purpose set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribin witnesses.

TREAT T. PROSSER.

Witnesses:

I. A. HOYNE, A. P.- Sherman; 

